2014-1-15 · for detecting surface displacement caused by underground coal mining is mentioned. Post-mining subsidence:This example deals with subsidence in an abandoned coal mining area located in Gaeun, Korea, reported by Jung et al. . From November 1992 to October 1998, 25 JERS-1 SAR interferometric pairs were used, and the crack level obtained by a
2017-8-16 · In recent 20 years, as the depletion of coal resources in shallow strata, coal mining operations have been moving to deeper strata . Approximately 60% of the coal mining works are conducted with a mining depth of over 800m in China . Mining works in deep strata are facing the chal-lenges ofhighground stresses andcomplexgeological condi ...
2020-3-15 · 1. Introduction. Coal is an indispensable energy source in human activities .More than 7 billion tons of coal is consumed in each year across the world in multiple industries, al, as a mixture of many organic substances, has well developed pores and fractures .A large amount of methane-dominated methane is adsorbed by the surface of the solid matrix of the coal, and there is a large …
2020-10-13 · ANALYSIS OF UNDERGROUND COAL MINE STRUCTURES SUBJECTED TO DYNAMIC EVENTS Underground coal mine explosions pose a significant threat to infrastructure such as mine seals and refuge alternative chambers. After a mine seal failed in the Sago mine disaster, which took the life of 12 miners, design requirements were reexamined and improved. However,
2020-10-10 · So, a creative approach of distributed settlement displacement monitoring of coal roadways roof was put forwards which combined distributed optical fiber sensing (DOFS) and pre-stretched optical fiber fixed-point layout (POFFL) technology in this paper.
2015-1-13 · Underground Coal Mine Monitoring with Wireless Sensor Networks MO LI and YUNHAO LIU Hong Kong University of Science and Technology Environment monitoring in coal mines is an important application of wireless sensor networks (WSNs) that has commercial potential. We discuss the design of a Structure-Aware Self-Adaptive WSN system, SASA.
2021-6-16 · Keywords: optical fiber sensors, shaft equipment condition monitoring, vibration signal, stress and strain, displacement. 1. INTRODUCTION . As an important part of coal mine, mine shaft is a throat project to promote the transportation of coal (or gangue),
Mine Gas is a natural product, produced during the geochemical conversion of organic substances to Coal (during carbonisation). The resultant gas is present both as liberated gas, in fissures, and as absorbed gas on the inner surface of the coal. During mining operations the mine gas is released, causing a real fire and explosive risk.
In the article the necessity of continuous control over the condition of the roof of mine workings is considered, to increase the safety in the conduct of mining operations. Provided the rationale for monitoring in complex mining and geological conditions, as well as in areas prone to rock blows and sudden coal emissions. The existing methods for controlling the displacement of the roof rocks ...
2019-4-3 · 1. Introduction. The constant and high-intensity mining of coal resources has prompted the rapid development of China''s economy, while at the same time, it also leads to severe ecological problems such as surface subsidence, air pollution and water loss [1–5].The production of coal inevitably results in the accumulation of huge amounts of waste rock at ground level, which not only occupies ...
Development and Displacement: The Case of an Opencast Coal Mining Project in Orissa Sthitapragyan Ray and Shashi Saini The involuntary displacement and resettlement of people by the state for development purposes is reflective of the dialectical relationship between the state''s use of coercive capacity against its citizens,
Four fiber optic methane sensors, two mining pressure sensors, two seismic sensors, one water pressure sensor and two temperature arrays combined with five fiber Bragg grating temperature sensors were installed at four underground locations, including one by an underground coal storage/refilling site, one by a wind-returning gate and one at a coal production front.
2014-10-1 · Based on the above discussion and analysis, this paper design a displacement sensor using fiber grating technology, which could be used to prevent the problem of coal mine tunnel collapse by monitoring the coal mine tunnel roof displacement. 2. Design and theoretical analysis of the sensor2.1. The force and displacement analysis of tunnel roof
Zhao et al.  designed an FBG displacement sensor to eliminate the crosssensitivity of temperature and displacement of FBG and prevent coal mine tunnel collapse by monitoring the roof ...
coal mining displacement sensor - mining application . Fibre optic sensors for mine hazard detection. The range of the fibre optic displacement sensor is 0- 200 mm, accuracy of 0.1% were ... ambient temperature sensor...
2020-12-21 · Abstract: Wireless Sensor Network (WSN) explores the use of the latest WSN technology in coal mine safety intelligent wireless monitoring, especially the three key technologies that need to solve the WSN wireless communication, transmission routing protocol and positioning algorithm for underground safety monitoring. The application of wireless sensor network in coal mine safety …
2021-3-27 · Panel of a Kilometer-Deep Coal Mine ... stalling stress sensors in the inclined borehole, Guo et al. found that the inﬂuence scope of the longwall mining reached 300m . e vertical stress experienced a peak ... Figure 5, vertical displacement of the immediate roof is
2015-2-24 · was performed using laser scanning in an underground coal mine, where the displacement was induced by removing material by hand from the ribs. Volume changes as small as 57 cm3, or slightly larger than a golf ball, and as large as 57,549 cm3, were detectable in this environment, despite the change in rib surface reflectance and mine geometry.
2012-9-16 · Abstract. The object of this paper is to present mining-induced displacement and resettlement (MIDR) as a highly diverse global socioeconomic issue occurring in all regions of the world, as a human rights issue, and as a source of challenges to public international law and and institutions providing humanitarian assistance.
bars as strain gauges and long gauge length displacement sensors were developed to monitor the rock displacement. The range of the fibre optic displacement sensor is 0- 200 mm, accuracy of 0.1% were achieved. 2.3. Fibre Optic Micro-Seismic Detection . A fiber optic accelerometer was developed for the detection of micro-seismic events in
coal mine, subject to service conditions, is the displacement sensor[14-16], which utilizes the magnetostrictive principle to generate a strain pulse signal through the
2020-10-13 · 2006 Coal Operators'' Conference The AusIMM Illawarra Branch 68 6 – 7 July 2006 . Seismic sensors . A total of 12 seismic sensors were installed in two locations. 11 of them were installed at the fourth cut-through (4 C/T) where the roof fracturing and damage during mining was monitored in detail. One sensor was installed at the
2019-7-1 · mining operations is called Coal mine methane (CMM). In recent years, there have been many 83 International Journal of Engineering Research & Technology (IJERT) Vol. 2 Issue 5, May - 2013 ISSN: 2278-0181 IJERTIJERT
2014-10-8 · change law for the mining process of mining the working face. Finally, we use the ''plate model'' theory to calculate the maximum failure depth of the rock strata of the working face floor for the Shuangliu Mine lower coal group. 2. Project overview Shuangliu Mine is located in the centre of the Hedong Coal Field of Shanxi Province.
2018-1-20 · Certain coal mine production capacity was 5.2 Mt/a, the main coal seam of colliery was 3# coal seam with a thickness of 1.5 m and a mining depth of 428 m, flat seam, the coal mining technology was sub-level caving mining, gas content was 7.65 m³/t, the immediate roof was sandy mudstone with a thickness of 3.2 m and basic roof was
2017-8-28 · FBG strain sensors reflects the changes in the strain of the concrete wall. A group of micro-seismic data are illustrated in the aspect of energy, length of time of the signal, and frequency. The results show the FBG sensors can be used in coal mines for coal mines safety. 2. FBG stress sensor applied in the coal mine
2021-1-21 · horizontal displacement Generally, the mining direction follows the strike direction, which is perpendicular to the inclined direction, to extract coal easily. Figure 1 illustrates the proﬁle of a mining subsidence basin after the coal mine has been exploited in the strike direction. At this point, the coal seam can be regarded as horizontal.
Using the wireless sensor networks, the coal mine can overcome the difficulties, and realize its coal mining, boring work surface, goaf gas, staff orientation such as wireless access detection. After the disaster, WSN can quickly reconstruct the environmental monitoring system to enhance the coal mine safety surveillance system in disaster ...
Coal mine Safety. Intelligent optical fiber sensor systems may help reduce the number of mining disasters. Tongyu Liu, Shandong Micro-Sensor Photonics Ltd., and Eric Bergles and William Yang, BaySpec Inc. According to the latest official mining statistics, from 2003 to 2006, more than 20,000 people died from coal mining accidents in China.